Bacteria, Viruses, Fungi, Protists & Parasites Pathogens Bacteria, Viruses, Fungi, Protists & Parasites

What is an infectious agent or pathogen? Infectious agents are organisms that enter the human body and effect its ability to maintain homeostasis (i.e. makes you sick).

Bacteria Round/Sphere-shaped, rod-shaped, or spiral- shaped Some have flagellas to help them move Food: parasitic, decomposer, photosynthesis, or consumer Unicellular Prokaryote (no nucleus) Reproduction: fission, conjugation Consists of cytoplasm and DNA surrounded by a cell membrane and a cell wall.

Examples Botulism Tuberculosis Pneumonia Meningitis E. Coli Salmonella

Think Pair Share How do we get rid of a bacterial infection?

Viruses Strand of DNA or RNA surrounded by a layer of protein that can infect and replicate in a host cell. Not considered living Unicellular Crystal, cylinder, sphere, and bacteriophage shapes Food – parasitic Active or Latent

Examples Rabies HIV Influenza Chicken pox Common cold

Think Pair Share How can we treat or prevent viruses?

Protists Eukaryote (has nucleus) Animal-like – consumers; unicellular; move with cilia, flagella, or pseudopod (Paramecium) Plant-like – photosynthesis; uni or multi-cellular; move with flagella (Algae) Fungus-like – decomposer; multicellular; do not move (slime mold) Asexual & sexual reproduction

Protists

Examples Malaria Giardiasis

Think Pair Share How can we determine whether the protest is plant- like, animal-like, or fungus-like?

Fungus Multi-cellular Decomposer or Parasitic Use hyphae to absorb food Club, sac, imperfect or zygote fungi Asexual or sexual reproduction using spores

Examples Athlete’s Foot Diaper Rash

Think Pair Share What are the best conditions for athlete’s foot or diaper rash to develop?

Parasites Flatworms – like tapeworms Arthropods – like lice, ticks, and mosquitos

Think Pair Share How do these pathogens affect the body’s ability to maintain homeostasis?